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    <title>立体曲面热力图 | Mars3D | 三维地图 | 火星科技 | 合肥火星科技有限公司</title>

    <!--第三方lib-->
    <script
      type="text/javascript"
      src="../lib/include-lib.js"
      libpath="../lib/"
      include="jquery,font-awesome,bootstrap,bootstrap-checkbox,layer,haoutil,turf,mars3d,mars3d-heatmap"
    ></script>

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  <body class="dark">
    <!--加载前进行操作提示，优化用户体验-->
    <div id="mask" class="signmask" onclick="removeMask()"></div>

    <div id="mars3dContainer" class="mars3d-container"></div>

    <!-- 图例面板 -->
    <div style="position: absolute; bottom: 30px; left: 10px">
      <img src="img/heatmap-tuli.png" height="200px" />
    </div>

    <div class="infoview">
      <div class="checkbox checkbox-primary checkbox-inline">
        <input id="chkUnderground" class="styled" type="checkbox" />
        <label for="chkUnderground"> 显示对应的数据点 </label>
      </div>
    </div>

    <script src="./js/common.js"></script>
    <script type="text/javascript">
      "use script"; //开发环境建议开启严格模式

      var map;

      function initMap(options) {
        //合并属性参数，可覆盖config.json中的对应配置
        var mapOptions = mars3d.Util.merge(options, {
          scene: {
            center: { lat: 31.794428, lng: 117.235343, alt: 2351.9, heading: 1.6, pitch: -28.8, roll: 0 },
          },
        });

        //创建三维地球场景
        map = new mars3d.Map("mars3dContainer", mapOptions);

        map.basemap = 2017; //蓝色底图

        // 加载城市模型
        var tilesetLayer = new mars3d.layer.TilesetLayer({
          url: "//data.mars3d.cn/3dtiles/jzw-hefei/tileset.json",
          maximumScreenSpaceError: 1,
          maximumMemoryUsage: 1024,
          center: { lat: 31.805004, lng: 117.222617, alt: 1457.4, heading: 1.6, pitch: -30.5, roll: 0 },
          popup: "all",
        });
        map.addLayer(tilesetLayer);

        // 视角切换（分步执行）
        map.setCameraViewList([
          { lat: 31.813938, lng: 117.240085, alt: 3243, heading: 357, pitch: -52 },
          { lat: 31.821728, lng: 117.253605, alt: 1702, heading: 319, pitch: -37 },
          { lat: 31.836674, lng: 117.260762, alt: 1779, heading: 269, pitch: -37 },
        ]);

        //创建Graphic图层
        var graphicLayer = new mars3d.layer.GraphicLayer();
        map.addLayer(graphicLayer);

        $("#chkUnderground").change(function () {
          var val = $(this).is(":checked");
          graphicLayer.show = val;
        });

        //测试点数据，实际开发时换掉
        var arrPoints = getRandomPoints(1000);

        //热力图 图层
        var heatLayer = new mars3d.layer.HeatLayer({
          positions: arrPoints,
          //以下为热力图本身的样式参数，可参阅api：https://www.patrick-wied.at/static/heatmapjs/docs.html
          heatStyle: {
            radius: 60,
            blur: 0.85,
          },
          //以下为矩形矢量对象的样式参数
          style: {
            arc: true, //是否为曲面
            height: 200.0,
          },
          // flyTo: true,
        });
        map.addLayer(heatLayer);

        //显示地面对应的点，测试渲染结果的正确性
        var arrEntity = [];
        for (var i = 0; i < arrPoints.length; i++) {
          var item = arrPoints[i];

          var primitive = new mars3d.graphic.PointPrimitive({
            position: [item.lng, item.lat, 90],
            style: {
              color: "#ffff00",
              pixelSize: 7,
            },
          });
          graphicLayer.addGraphic(primitive);
        }
        graphicLayer.show = false;
      }

      //获取bbox矩形区域内的count个随机点
      function getRandomPoints(count) {
        var xmin = 117.226189,
          xmax = 117.245831,
          ymin = 31.828858,
          ymax = 31.842967;
        var arr = [];
        var arrPoint = turf.randomPoint(count, { bbox: [xmin, ymin, xmax, ymax] }).features; //随机点
        for (var i = 0; i < arrPoint.length; i++) {
          var item = arrPoint[i].geometry.coordinates;
          var val = Math.floor(Math.random() * 100); //热力值
          arr.push({ lng: item[0], lat: item[1], value: val });
        }
        return arr;
      }
    </script>
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